package com.itheima.reggie.checkFilter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author 何须浅碧深红色
 * @date 2022/9/12
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1，获取本次请求的路径
        String uri = request.getRequestURI();
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2，判断本次请求是否需要处理
        boolean check = check(urls,uri);
        if (check){
            //为true不需要处理，直接放行
            log.info("本次请求{}不需要处理",uri);
            filterChain.doFilter(request,response);
            BaseContext.removeCurrentId();
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            //查看多条操作是否在一个线程里面
//            long id = Thread.currentThread().getId();
//            log.info("线程id为: {}",id);
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            BaseContext.removeCurrentId();
            return;

        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("未登录，返回登录页面");
        //如果登录未成功，用流的形式响应给前端
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        BaseContext.removeCurrentId();
        return;

    }
    //判断请求路径是否需要放行
    public boolean check(String[] urls,String uri){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if (match){
                return true;
            }
        }
        return false;
    }
}
